Remove library warning in rp2040 dir

earlephilhower · earlephilhower · commit 6f915a901d50 · 2021-03-21T11:27:37.000-07:00
diff --git a/libraries/rp2040/dummy_rp2040.h b/libraries/rp2040/dummy_rp2040.h
@@ -0,0 +1 @@
+/* Dummy header for Arduino */
